Exception F200 wood Insert
5
Controls
Two important controls - the damper handle and
the air control lever regulate the operation and output of
the insert.
Move the damper handle to the forward position
(approximately 3") and the handle automatically opens the
bypass damper. In this mode of operation the combustion
gases go directly from the main combustion chamber to
the flue collar and exit into the chimney.
NOTE: The bypass damper must be open for
smokeless loading.
Air Control
. The air control rod is located directly
below the ash lip on the left side of the insert. Using this
lever you will be able to vary the amount of air delivered
to the fire, creating a range of heat outputs. The low heat
output setting is with the control pushed all the way in.
The high setting is with the control pulled all the way out.
Do not, under any circumstances, alter the configuration
or operation of the air control rod.
The Combustion Process
Combustion in your Harman Exception wood
insert is controlled very precisely. During a wood fire, pri-
mary combustion air enters the bottom of the insert, is di
-
rected up to the top of the load door and then down past the
glass, finally entering the combustion chamber. Secondary
combustion air enters the bottom of the insert and is deliv
-
ered directly to the afterburner behind the firebox, where it
provides the additional oxygen required for clean burning.
During combustion, burning proceeds through
several stages - an initial evaporation stage, where mois-
ture is released from the wood; a stage where volatile
gases containing much of the wood’s heating capacity
are released and burned; and a charcoal stage, where the
remaining charcoal burns to release the additional heat
available. What is left after this final stage is ash. Within
the firebox, two or more of these stages are generally
occurring at once.
damper Closed
damper Open
